134 FUNGUS-FLOEA. 



On bark and wood. Intermediate beween Stereum hirsutum 

 and S. purpureum, agreeing with the former in the coarsely 

 strigose pileus, and with the latter in the colour of the hyine- 

 nium ; known by its thinner substance, which becomes more 

 or less torn when dry. 



*** Entirely resupinate, margin scarcely or not at all free. 



Stereum rufum. Fr. 



Coriaceous-cartilaginous, erumpent, at first tuberculiform, 

 then expanding and forming small circular patches ; hyrne- 

 nium rufous, then brownish, powdered with a grey bloom, 

 more or less tuberculose, at length cracked ; spores elliptical, 

 6-7 X 4 p. 



Stereum rufum, Fries, Epicr., p. 552; Mass., Mon. Thel., 

 p. 198. 



On bark, usually lime. Bursting through the bark as 

 rounded patches, which spread for some distance, keeping 

 more or less circular in outline, thin, extreme margin free ; 

 looking like a Corticium in habit; hymenium with small 

 tubercles that are often arranged in indistinct concentric 

 circles. 



Stereum frustulosum. Fr. 



Tuberculose, woody, crowded and almost confluent, hence 

 looking like one much cracked specimen, under surface and 

 margin glabrous, brownish-black; hymenium convex, cin- 

 namon, becoming pale, pruinose; spores elliptical, ends 

 subacute, 4-5 x 3-3-5 /*. 



Stereum frustulosum, Fries, Epicr., p. 552 ; Mass., Mon. 

 Thel., p. 199. 



Thelephora frustulosa, Fries, Syst. My col. i. p. 445. 



On wood and bark. Some states superficially resemble 

 Corticium polygonium. Thick, tuberculose small patches almost 

 confluent ; the patches are often cracked completely through, 

 so that the whole presents a tesselated appearance ; hyme- 

 nium usually cinnamon, becoming paler, but sometimes 

 persistently brown. 



Stereum acerinum. Fr. 



Forming a thin, white, often broadly and irregularly 

 effused crust, even, smooth ; spores elliptical, 6 x 3-4 /*. 



